Hi Paul
I have just flown with similar unit to the Viking spring. Yes, you are right, no need to mill out the V, because the rudder feel comes OK once the bungee is removed And you are right on ground handling - I surprised myself a bit on landing first time so better use ballet slippers than workboots. Not really, but it is much lighter with the spring than with the bungee so a light touch on the pedals is needed. I had 900hrs with bungees, never go back...
Peter